Ments



A. B. CADMAN.

TRAILER TRUCK. APPLICATION flLED NOV. 2. HM?- Patented June 3, 1919.

tion. Said truck which is UNITED STATES PATENT OFFICE.

ADDI nnmamm cabmm, or nnnorr, Wisconsin, assrei'won, BY MESNE assidu-MENI'S, 'ro wamrnn mmrao'runme comranr, or sourn BELOIT, ILLINOIS,

A conronnrron or Wisconsin.

TBAILEEJBUGK.

original application nice December 6,1916, Serial in. 135,419. mviaeaEnd this application filed November Specification of Letters latent.

Patented June 3, 1919.

2, L917. Serial No. 199,819.

To all whom it may concern Be it known that I, Anni BENJAMIN CAD- MAN, acitizen of the United States, residing at Beloit, in the county of Rockand State of Wisconsin, have invented certain new and usefulImprovements in Trailer-Trucks, of which the followin is aspecification.

The invention re ates to reversible trailer trucks of the type ada tedto be hitched onto a motor vehicle or ot er drawing unit and coupledtogether with any desired number of trucks to form a train; and theinvention relates more particularly to a locking device for draw-bars.

Trailer trucks of the ty set forth are of duplicate construction attiizir opposite ends, so that each truck is adapted to be drawn orsteered from either end. For this reason it becomes necessary, in use,to lock the drawbar at the endof the truck-formin the rear end, againstlateral movement; an it is the object of this invention to provide areadily operable locking device of im roved con struction which is adated to e ectively accomplish its designate function.

The object. of the invention thus nerally stated, together with otherand ancfil ary advantages, isattained by the constructioniand arranement illustrated in the accompany-- ing rawings forming 'a part hereof,in which Figure 1- is a fragmental top plan view of one end .of atrailer truck having a lockin device thereon embodying my invention. ig.2 is an enlarged fragnental lon tudinal section on line 2-2 of 1g. 1.Fig. 8 is a fragmental transverse section .on me 38ofFig 2. e

In the drawings I have illustrated a preferred form of truckembod ing myinvenescribe'd in my copending application Serial- No. 135,419, filedDecember-6, 1916, and of which this aplication is a division ar bodyframe 10 of an common or. referred construction whic is Biippo at eachside through the medium of two springs 11 from an axle 12. Wheelalfi aremounted on journals carried by ateeringknuckles 1 which are pivoted toopposite ends of the axle to swing on vertical a reslfi. Each comprisesa rectangu;

other end o said pin is normally the frameand the two arms are directlconnected b a ri id transverse tie mom 1' or rod 17, t een of which areivoted to the endsof the arms. The drawar 18 may be of any common orpreferred" construction and is pivoted by means of a vertical kin pin 19to a crosspiece 20 formin' a rigi part'of the frame 10. The en of saiddraw bar, which is nearest the center of the truck,- issuitabiyconnected to the tie rod 17 as by means'of vertically andhorizontally disposed yoke members 21 and '22 pivotally connectedtogether and to the tie rod and draw-bar'respectivel The free end ofsaid draw-bar extends t rough a horizontally zontal swinging movement ofthe bar for steerin purposes.

The locking device which I have provided for locking't e draw-'bar incentral osition at the'end of the,truck, co:rises a etch or retainingmember 26 ivot the longitudinal in ian line thereof and adapted to beswung into and out of operative engagement with the draw-bar. For thispurpose a plairof upstanding lugs 27v are carried by t e draw-bar.- Themember 26 is bifurcated and is pivoted on. a horizontal axis to a lug 28protruding from a plate 29 suitabl horizonta guideway 23' formed orsecured on t e up 1' surface of the draw-bar beyond the bo frame and arespaced apart to form a keeper for the retaining member 26. l a v 1 Theretaining member is arranged to be held in either its operative orlocking position or its inoperative position b \means of a detentcarried thereby. the form of a in. 30 arranged tube actuated by a spring8 and having a head'32'on one end norma ly held by the spring in mentwith the free end of the retainer. did by the to the frame on.

secured to the bar 24 formin the" and the lugs 2, are

Said eten't is in sis the ,frame on the median line spring in engagementwith either of two recesses or notches 33 and 33' located at the upperand rear surfaces respectivel of the lug 28. B this construction it wilbe evident that t e retainin member may be readily released from ei erits ino erative or operative position by grasping t e head 32 andwithdrawing the pin 30 against the action of its spring.

.Atthe free end of the draw-bar 18 a coupling head 340i any preferredconstruction is provided by means of which the draw-bar is coupled tothe draft device attached to the drawin vehicle or the vehicle tobedrawn.

I claim as my invention:

1. A truck having, in combination, a body frame, a draw-bar pivoted ,tothe body frame and having a pair of lugs thereon, and a device ivoted onthe longitiidinal median line of 51c body frame and movable into and outof engagement with said lugs on the draw-bar whereby to hold thedraw-bar in,

central position when desired.

2. A truck having, in combination, a body frame, a'pivoted draw-barhaving a pair of lugs thereon, a, device pivoted on the longitudinalmedian-line of the body frame and movable into and out of engagementwith said lugs on the draw-bar whereby to hold the draw-bar incentraslegosition when desired, and a spring-pres detent carried by saiddevice and engaging part on the body frame to hold the device inPosition.

3; A truck having, in combination, a pivoted draw-bar, a body framehavin a horizontally elongated guideway throug which the draw-barextends, a lug on the end of ereof, a retainer pivoted on ahorizontalaxis on said lug, a air 9f in on the draw-bar in front of therame, saigi retainer bein arranged to engage with the last "mention lugsto hold the draw-bar in central position with respect to thebody frame,and a spring-pressed detent arranged to engage in recesses in the saiddevice including operatlvely en able into holding engagement with theother 1 one. of said members;

5. A trailer truck having, in combination, a body frame, a draw-baroperatively associated with the frame and a locking device for holdingthe draw-bar in central position with reference to the'frame whendesired, a fixed member and a, pivoted member swingable into and out oflocking engagement with said fixed member and having yielding means for.locking said pivoted member in either operative or inop erativeposition.

. 6. In combination with a trailer truck having a body frame and adraw-bar operatively associated therewith, a locking device for holdingthedraw-bar in central position with reference to the frame when desiredincluding a pivoted latch member'adapted to ge with the draw-bar, andmeans. for holding the latch out of operative engagement with its keeer.

7. In combination with a trailer truck having a body frame and adraw-bar operatively associated therewith, a locking device for holding,the draw-bar in central position with reference to the frame-whendesired, including a pivoted latch member, and

means for locking said latch member against pivotal movement.

In testimony whereof, I have hereunto set my hand. r

ADDI BENJAMIN CADMAN.

Correction in Letters Patent No. 1,305,521.

It is hereby certified that in Letters Patent No. 1,305,521, grantedJune 3, 1919,

upon the application of Arldi Benjamin Cadman, of Beloit. Wisconsin. foran improvement in Trailer-Trucks," an error appears in the printedspecification requiring correction as follows: Page 2, line 79, claim 6,for the words "its keeper read the drawbar; and that the said LettersPatent should be read with this correction therein that the same mayconform to the record of the case in the Patent Oflice.

Signed and sealed this 19th day of August, A. D., 1919.

J. T. NEWTON,

Commissioner of Patents.

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